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Lubricants_Improving Fuel Efficiency-Legacy Vehicl #4713630
04/01/18 09:24 PM
04/01/18 09:24 PM
Joined: Dec 2002
Posts: 42,714
'Stralia
Shannow Offline OP
Shannow  Offline OP

Joined: Dec 2002
Posts: 42,714
'Stralia

Re: Lubricants_Improving Fuel Efficiency-Legacy Vehicl [Re: Shannow] #4713665
04/01/18 10:19 PM
04/01/18 10:19 PM
Joined: May 2010
Posts: 9,960
out there
spasm3 Offline
spasm3  Offline

Joined: May 2010
Posts: 9,960
out there

I found the chart on page 15 interesting


13 elantra 75k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 9500 miles m1 0w30
Re: Lubricants_Improving Fuel Efficiency-Legacy Vehicl [Re: spasm3] #4713682
04/01/18 10:46 PM
04/01/18 10:46 PM
Joined: Dec 2002
Posts: 42,714
'Stralia
Shannow Offline OP
Shannow  Offline OP

Joined: Dec 2002
Posts: 42,714
'Stralia
Yes, big ends aren't supplied lubricant for their full 360 degrees of movement, so while hydrodynamic typically reigns, there is a bit "squeeze film" effect as the load is applied on the firing stroke.

For e.g.


This one is interesting in that it shows standard operation of an engine (grey line), and what happens in de-activated cylinders and those still in service...

Re: Lubricants_Improving Fuel Efficiency-Legacy Vehicl [Re: Shannow] #4713694
04/01/18 11:06 PM
04/01/18 11:06 PM
Joined: May 2010
Posts: 9,960
out there
spasm3 Offline
spasm3  Offline

Joined: May 2010
Posts: 9,960
out there
I once rebuilt a small block ford 302. I noticed the front main bearing seemed to be worn more than the others. It fired on 1 then 5. So 2 cylinders loading the front bearing first.

( firing order 1 5 4 2 6 3 7 8 )

I changed with firing order with a 351w cam. ( 1 3 7 2 6 5 4 8


13 elantra 75k 5w30 QSUD
03 chevy avalanche 80k synpwr 5w30
17 mazda cx-5 9500 miles m1 0w30
Re: Lubricants_Improving Fuel Efficiency-Legacy Vehicl [Re: Shannow] #4713768
04/02/18 04:42 AM
04/02/18 04:42 AM
Joined: Sep 2010
Posts: 7,485
S California
OneEyeJack Offline
OneEyeJack  Offline

Joined: Sep 2010
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S California
Page 12 shows an increase in FEI going from a 10w-30 to a 5w-30. Interesting.

Re: Lubricants_Improving Fuel Efficiency-Legacy Vehicl [Re: Shannow] #4713855
04/02/18 07:28 AM
04/02/18 07:28 AM
Joined: Feb 2003
Posts: 8,184
Jupiter, Florida
Cujet Offline
Cujet  Offline

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Posts: 8,184
Jupiter, Florida
Quote: Use of low-viscosity lubricants, while effective in reducing fuel
consumption, will increase contact severity

Originally Posted By: spasm3

I found the chart on page 15 interesting


Agreed. It's something we've known for some time now. Thin oils and heavily loaded bearings don't go together well.


Last edited by Cujet; 04/02/18 07:37 AM.

People who count on their fingers should maintain a discreet silence.
Re: Lubricants_Improving Fuel Efficiency-Legacy Vehicl [Re: spasm3] #4713954
04/02/18 09:42 AM
04/02/18 09:42 AM
Joined: Dec 2016
Posts: 8,198
Waco, TX
Linctex Offline
Linctex  Offline

Joined: Dec 2016
Posts: 8,198
Waco, TX
Originally Posted By: spasm3

I changed with firing order with a 351w cam. ( 1 3 7 2 6 5 4 8 )


Smallblock Chevy 350 is the same but mirror image


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
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